晋西北丘陵风沙区柠条锦鸡儿叶片与土壤生态化学计量特征  

Leaf and soil ecological stoichiometry of Caragana korshinskii in windy and sandy hilly region of northwest Shanxi,China

作　　者：刘婧 缑倩倩 王国华[1,2,3] 赵峰侠 LIU Jing;GOU Qian-Qian;WANG Guo-Hua;ZHAO Feng-Xia(College of Geographical Sciences,Shanxi Normal University,Taiyuan 030000,China;Linze Inland River Basin Research Station,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730010,China;Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Science,Lanzhou 730010,China)

机构地区：[1]山西师范大学地理科学学院,太原030000 [2]中国科学院西北生态环境研究院中国生态系统研究网络临泽内陆河流域研究站,兰州730010 [3]中国科学院西北生态环境研究院沙漠与沙漠化重点实验室,兰州730010

出　　处：《植物生态学报》2023年第4期546-558,共13页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(41807518和42171033);山西省高等学校科技创新项目(2019L0457和2019L0463);中国科学院沙漠和沙漠化重点实验室开放基金项目(KLDD-2020-05)资助。

摘　　要：柠条锦鸡儿(Caragana korshinskii)是晋西北丘陵风沙区主要的退耕还林植物,在维持群落物种多样性、生态系统稳定和土壤环境恢复等方面发挥着非常重要的作用。为探究不同林龄柠条锦鸡儿人工林生态系统碳(C)、氮(N)、磷(P)化学计量特征与叶片光合作用和土壤环境因子之间的相互关系,该研究以晋西北丘陵风沙区不同林龄(0、6、12、18、40和50年)柠条锦鸡儿人工林植物叶片和土壤为研究对象,分析了柠条锦鸡儿叶片和土壤C、N、P化学计量的变化特征及其相互关系。结果表明:1)随着林龄的增加,柠条锦鸡儿叶片C、N含量显著增加,P含量呈先增加后减少的趋势,叶片的C、N、P含量分别在434.14–452.26、15.72–28.11、1.32–1.95 g·kg^(-1)之间,其中叶片C、N含量均在林龄50年达到最大值,而叶片P含量在林龄18年达到最大值;叶片C:N呈先增加后减少的趋势,林龄18年达到最大值,N:P呈显著增加趋势,林龄50年达到最大值。叶片的光合色素(叶绿素a、叶绿素b、类胡萝卜素和总叶绿素含量)随着林龄增加呈显著下降的趋势,叶片的C、N含量对光合色素含量变化具有显著的影响。2)土壤含水量在0–20 cm土层呈先增加后减少趋势,尤其在林龄18年之后显著下降;0–20 cm土层中的土壤有机碳(SOC)和全氮(STN)含量随着林龄的增加而增加,土壤全磷(STP)含量无显著变化。土壤C:N、C:P和N:P随着林龄的增加呈增加的趋势。3)柠条锦鸡儿人工林土壤含水量与SOC和STN含量具有显著正相关关系,SOC和STN含量之间也呈显著的正相关关系;柠条锦鸡儿叶片N和P含量具有显著正相关关系;叶片C、N含量与土壤SOC、STN、STP含量之间均呈显著正相关关系,与土壤含水量呈负相关关系,叶片化学计量比与土壤化学计量比之间呈显著正相关关系。随着林龄的增加,柠条锦鸡儿人工林主要受P含量及土壤含水量的影响。该研究结果对系Aims Caragana korshinskii is the dominant species in the hilly area of northwest Shanxi,which plays very important roles in maintaining community species diversity,ecosystem stability and soil environment restoration.Methods In order to investigate the stoichiometric characteristics of carbon(C),nitrogen(N),phosphorus(P)in the ecosystem of C.korshinskii artificial forest with different ages and their effects on leaf photosynthesis,the plant leaves and soil of C.korshinskii artificial forest with different ages(0,6,12,18,40,and 50 years)were collected.The variations of C,N,P stoichiometry in plant leaves and soil were analyzed.Important findings With the increase of plantation time,the contents of C and N in the leaves of C.korshinskii increased significantly,while the contents of P increased firstly and then decreased.The contents of C,N and P in the leaves ranged from 434.14–452.26,15.72–28.11 and 1.32–1.95 g·kg^(-1),the contents of C and N in leaves reached the maximum value after 50 years of plantation,while the content of P in leaves reached the maximum value after 18 years of plantation.Leaf C:N increased first and then decreased,and reached the maximum in 18 years,while N:P increased significantly and reached the maximum in 50 years.The photosynthetic pigments(chlorophyll a,chlorophyll b,carotenoid and total chlorophyll)contents of leaves decreased significantly with increasing time of plantation,and leaf C and N contents had a significant effect on the changes of photosynthetic pigments contents.Soil water content increased first and then decreased with increasing time of plantation in the 0–20 cm soil depth,and decreased significantly after 18 years of plantation.Soil organic carbon(SOC)and total nitrogen(STN)contents in the 0–20 cm soil depth profile increased with increasing time,and soil total phosphorus(STP)contents had no significant change with time.Soil C:N,C:P and N:P increased with the increase of forest age.Soil water content of C.korshinskii was significantly positively correlated wi

关 键 词：晋西北 丘陵风沙区 柠条锦鸡儿 人工林 叶片 土壤 生态化学计量学 

分 类 号：S793.3[农业科学—林木遗传育种] S714[农业科学—林学]